Hydrometer



Feb. 12, 1929.,

G. E. ANDERSON HYDROMETER Filed April. 22, 1926 J: V f

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GEORGE E. ANDERSOhT, OF CHICAGO, ILLINOIS.

HYDROMETER.

Application filed April 22, 1e2e. Serial No. 103,718.

liquid flows or drips out through the nozzle during this time, The escape of the liquid in this way is always objectionable and is particularly so when it is acid taken from a storage battery, or a similar fluid.

One of the objects of the present invention is so to construct and arrange a hydrometer syringe that liquid, once drawn into the same, cannot escape until the user wishes it.

One of the most common type of hydrometer syringes is that in which the nipple is a part of a stopper or plug that is fitted into the end of the barrel. The acid or other liquid in many cases finds its way between the stopper or plug; and the surrounding portion of the barrel, permitting the stopper or plug to drop out and spill the contents of the syringe.

A further ob ect of the present invention is to produce a simple and novel plug or sto nior construction which, although it may readily be applied or removed, will be firmly hold in the barrel of the syringe, and avoid the possibi My of becoming: loose and dropping out accidentally.

The various feature" of novelty whereby my invention is charaete I id n 'll hereinafter be c pointed out with particularity in the claims; but, for full understanding of my invention and of its objects and advantages, reference may he had to the tollowi up; detailed description taken in connection. with the accompanying drawing, wherein:

Figur 'l is aside elevation oil a hyd romctcr mcordance with the present in 2* 1g. 2 a vertical section, on a larger scale, tl'u'ough the lower end ot the barrel and the upper end of the nippltyon a plane containing the longritudiiml axis or? the device; and hi 3 and 4 are longitudinal central sections through modified forms of plugs.

Referring to the drawing, 1, 2 and 3 represent respectively the barrel, the compressible bulb, and the soft rubber nippleiof a In accordance with one lay; Lronuitcr syringe. ,2 1i r 1.:

feature oi my invention I bore through or otherwise form in the nipple a transverse hole at that intersects the passageway 5 through the nipple. A plug valve 6, perforated as at 7,

is fitted in this hole. The diameter of the valve is greater than the normal diameter of the hole, so that the valve will fit tightly into the hole. On one end of the valve is a handle or fingerpiece 8 terminating at the base in a flange 9, and at the other end of the valve is a head 10 whoseshape is more or less conical. The parts are so proportioned that the head 10 may be pushed or pulled through the hole in tho nipple when sutlic ient force is applied;

but, normally, the flange 9 and the head will engage with the nipple at opposite sides of the latter andwill hold the valve against'accidental disengagement from the nipple.

Vi hen the valve is in the position shown in Fig. 2, the passage 5 is closed and no fluids can leave or enter the syringe. lVhen the valve is turned through an angle of ninety degrees, the perforation or port Tregisters with the passage 5 so that the fluids may pass freely through the nipple.

It will therefore be seen that the inlet and. outlet to the syringe may be effectively sealed by the addition ot the simple one-piece valve that is simply forced through a hole in the nipple, the rubber of the nipple serving to seal the joint and prevent leakage past the valve.

The nipple usually has formed integral therewith a member for attaching it to the barrel of the hydrometor, although such memher and the nipple need not be made of a single piece. Where the attaching member is in the form of a stopper that entersthe end of the barrel, it sometimes becomes loose and drops out. I provide the stopper and the barrel with interlocking shoulders which, because of the flexibility of the rubber of which the stoppers are made, permits the stoppers to be inserted and removed, without ditliculty, but prevents accidental displacement. To this end, the

barrel i s abru 'itly enlarged in diameter near In accordance with my invention, 1

erably provided with an enlargement 14 at such a distance from the upper end that this enlargen'ient will engage with the extreme end of the barrel when the stopper is in place, thus preventing the stopper from being pushed in too far and, at the same time preventing the glass barrel from coming in contact with a flat surface when the syringe is laid on its side.

In the arrangement shown in Fig. 3, the stopper 15 has a bead 16 projecting laterally and upwardly, whereas the stopper 1'7 in Fig. i has a bead or flange 18 projecting laterally and downwardly from the upper end. The arrangement shown in Fig. 4 is perhaps prefrable to that shown in Fig. 3 since, after the flange or bead has positioned itself in the groove, a downward pull on the stopper will tend to increase the external diameter of the bead or flange, causing it to be pressed more tightly into the groove.

"While I have illustrated and described with particularity only a single preferred form of my invention, with slight modifications, I do not desire to be limited to the exactstructural details thus illustrated and described; but intend to cover all forms and arrangements which come within the definitions of my inyention constituting the appended claims.

I claim:

1. t hydron eter syringe having a rubber nipple at one end, said nipple having a hole extending transversely through the same, a perforated plug of larger diameter than the normal diai'neter of the hole passing through the nipple, a handle on one end of the plug, and a head on the other end of the plug small enough to pass through the hole when a strong pressure is applied.

2. in a device of the character described, a

glass barrel, a compressible bulb connected to one end of the barrel, said barrel being abruptly expanded near the other end to form an annular interior groove extending around the same, a nipple having thereon a rubber plug adapted to fit into said latter end of the barrel, said plug having a shoulder adapted to engage the extreme end of the barrel, and said plug being enlarged at its inner end to form an annular bead adapted to [it into said annular groove.

In testimony whereof, I sign this specification.

GEORGE E. ANDERSON 

